diff --git a/src/mermaid.ts b/src/mermaid.ts
index 48c2f8790..c93c6c94e 100644
--- a/src/mermaid.ts
+++ b/src/mermaid.ts
@@ -30,12 +30,14 @@ import { isDetailedError } from './utils';
  * ```
  *
  * Renders the mermaid diagrams
+ *
  * @param config
  * @param nodes
  * @param callback
  */
 const init = function (
   config?: MermaidConfig,
+  // eslint-disable-next-line no-undef
   nodes?: string | HTMLElement | NodeListOf<HTMLElement>,
   callback?: Function
 ) {
@@ -54,6 +56,7 @@ const init = function (
 
 const initThrowsErrors = function (
   config?: MermaidConfig,
+  // eslint-disable-next-line no-undef
   nodes?: string | HTMLElement | NodeListOf<HTMLElement>,
   callback?: Function
 ) {
@@ -156,13 +159,7 @@ if (typeof document !== 'undefined') {
   /*!
    * Wait for document loaded before starting the execution
    */
-  window.addEventListener(
-    'load',
-    function () {
-      contentLoaded();
-    },
-    false
-  );
+  window.addEventListener('load', contentLoaded, false);
 }
 
 /**
diff --git a/tsconfig.json b/tsconfig.json
index f3a860e32..6a29f8328 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -13,7 +13,8 @@
     /* Language and Environment */
     "target": "es2016" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,
     "lib": [
-      "ES2021"
+      "ES2021",
+      "DOM"
     ] /* Specify a set of bundled library declaration files that describe the target runtime environment. */,
     // "jsx": "preserve",                                /* Specify what JSX code is generated. */
     // "experimentalDecorators": true,                   /* Enable experimental support for TC39 stage 2 draft decorators. */